Q3. i) What is meant by the term 'corrosion' and how does it occur in nature? (6)
ii) Name different types of 'wet and dry corrosion' (at least 4 of them) with brief account of their occurrence and suitable preventive measures for their control. (10)
Q2. What is mean by 'corrosion control'? List out the techniques used in effecting corrosion control and render brief explanation of same. Give one example each of their application. (16)
Q1. With reference to corrosion processes:
a) Explain the mechanism of
i) Stress corrosion. (4)
ii) corrosion fatigue. (4)
b) State where the following types of corrosion may occur, and the materials commonly involved in each case.
i) Fretting corrosion. (4)
ii) Galvanic corrosion. (4)
Q1. Considering effect of corrosion, describe choice of material for following with reasons.
(a) Sea Water pump body. (4)
(b) Sea Water Pump Impeller. (4)
(c) Sea Water Pump Shaft. (4)
(d) Filter boxes (4)
Q2. Define substantial corrosion in the context of ship structure and classification requirements. What criteria are used to assess substantial corrosion during inspections? Discuss the steps taken to address substantial corrosion during a renewal survey, including inspection techniques, repair methods, and the role of the classification society in ensuring compliance. (16)
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